[ARC Tech-109]

I have a Panasonic AG-7500 and used the PAL service manual pdf on the'net to rework the power supply, same goofy issues. Issue is the supply is actually a DC buck design and uses these oddball switching transistors, currently it still has a 120hz ripple that's superimposed on the HF regulator and its getting into the chroma upconversion stages...

I've had the deck since new and mechanically it's been solid, the bonus was the independent audio channels and I used a Sanyo N55plus on the linear side. If I had to bitch it would be the brittle plastic parts for the flip down control drawer and now the electrolytics, Panasonic got carried away with them.

Best advice I can offer is to pull out the rear power supply board and replace all the caps with low ESR equivalents where possible, do a Google search for the Panasonic AG-7500P service manual pdf or grab the CD Rom from eBay, it's item #264941926972 and only $19.25+shipping. They are good decks that are worth the money and effort to preserve, JVC can't touch them.

Didn't see you had a manual.

Mode switch can be cleaned but it's going to take some effort, manually cycle it many times and it will eventually break thru the tarnish on the contacts.
Check the supply voltages and follow the troubleshooting flowchart, again you're going to run into rotten caps that may be pulling down the+5v rails on the logics.